Creatures and beings originating in the science fiction genre.
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- Mahar
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- Martian Invaders
- Mashons
- Maytus of the Beasts
- Mechanical Man
- Mechanical Monsters
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- Micromégas
- Microscopic Neanderthals
- Midget Robots
- Modo
- Monster of Lake LaMetrie
- Monstro
- Mooniacs
- Morlocks
- Murderous Steam Shovel
- Music Makers of Alderbaran
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